Abstract
A simple and selective method for separation and preconcentration of nickel has been developed. The method is based on the flotation of a complex of Ni and dimethylglyoxime (DMG) at the aqueous solution-n-hexane interface. The complex was separated and Ni determined spectrophotometrically by DMG after addition of oxidizing agent. The quantitative flotation of the complex was possible in the pH range of 9-12. The method is simple and free from the interference of all cations and anions and has a wide linear range. The procedure was successfully applied to the determination of trace amounts of nickel in well water and waste water in coating plant. The method's accuracy was investigated by using standard reference materials alloys (NIST 864) and by spiking the samples with different amounts of Ni2+.
Highlights
Nickel is an important constituent of several steel alloys
Dimethylglyoxime (DMG) is widely used and for the spectrophotometric determination of nickel[3,4] it has been used for separation and preconcentration of Ni by liquid-liquid extraction[5] or solid phase extraction[6,7,8] but all of these separation methods suffer from lack of selectivity
Though the spectroscopic evidence indicated the presence of various nickel-DMG complexes with different ratios of metal to ligand (1:2 and 1:4) in solution, the
Summary
Nickel is an important constituent of several steel alloys. Dimethylglyoxime (DMG) is widely used and for the spectrophotometric determination of nickel[3,4] it has been used for separation and preconcentration of Ni by liquid-liquid extraction[5] or solid phase extraction[6,7,8] but all of these separation methods suffer from lack of selectivity. Metal ions such as Ni(II), Pb(II), Mn(II), Bi(III), Co(II), Cd(II), Zn(II), and Fe(II) could interfere at concentrations higher than 5 mg L-1 in solid phase extraction of Ni2+ using DMG as a complexing agent.[8].
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